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Foundry Flux Slag Liquid Steel Cast Filtration Zirconia Ceramic Foam Filter 50X25mm. High Porosity Structure: 80-87% porosity with open pore reticulated structure. Deep Bed Filtration: Retains inclusions smaller than pore openings throughout cross-section. Customizable Hole Density: Available in 10, 20, or 30 PPI options for specific needs. Zirconia Material: Main material is ZrO2 for superior performance in steel casting.